There is no reason that the variation 1.d4 Nf6 2.c4 g6 3.g3 Bg7 4.Bg2 0-0 5.Nf3 d6 6.0-0 c5 fell out of fashion. Soltis proves this by giving you excellent analysis and strategy in this variation. He brings back a 1950's variation to surprise your opponents. This system has a bit of a Benoni feel to it by attacking white's center with 6..c5 instead of 6..e5. This should be called the Gligoric system since it was the veteran GM Svetozar Gligoric who first demonstrated Black's resources most successfully. This system is a dangerous surprise weapon in the King's Indian that can be employed at all levels.

GM Soltis: ''Against the King's Indian Defense and the Benoni Group(all of them: Czech, Modern, etc..)there is a simple, relatively new, yet ambitious setup that can be played effectively against each member of the family...the key element here is the bishop on d3(5.Bd3!)''. This book also tells you how to play against the Old Indian and Modern defenses.